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. 2019 Jun 19;10:769. doi: 10.3389/fphys.2019.00769

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Copyright © 2019 Alcazar, Csapo, Ara and Alegre.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Force-velocity relationship. Data were obtained from Figure 1 in Ralston et al. (1949) using specialized software (ImageJ 1.51q8, NIH, United States). This modified version represents the force-velocity relationship of the in vivo human pectoralis major muscle. A linear function was fitted to the data above 40% of maximal isometric force (P₀) (F = –0.29 × V + 20.43; R² = 0.996) and a second order polynomial function was fitted to the data below 40% of P₀ (F = 0.0008 ×V² – 0.2335 ×V + 16.991; R² = 0.983) (least squares method in both).